# an invoicing tool for fitness studios **Fitness-studio invoicing is already crowded with gym management tools; a standalone invoicing wedge looks weak unless it handles studio-specific billing better than the suite products.** Confidence: high · 52 signals · checked 2026-08-01 [Full report with live links](https://showsitsworks.com/idea/an-invoicing-tool-for-fitness-studios) ## Who is already building this *From data* - Invoiv is positioned specifically for gyms and fitness trainers, with recurring billing and customizable payment handling. - [Powerful Invoicing for Gyms and Fitness Trainers | Invoiv](https://invoiv.com/invoicing-for-gyms-and-fitness-trainers) `tavily` - WaffleInvoice is aimed at personal trainers, and its pitch is that dedicated invoicing is faster to set up and cheaper than all-in-one platforms for staff-heavy studios. - [Best Invoice Software for Personal Trainers - WaffleInvoice](https://www.waffleinvoice.com/blog/best-invoice-software-for-personal-trainers) `tavily` - Zen Planner is already selling payments and billing software for boutique fitness studios, including automated recurring billing. - [Payments and billing software for boutique fitness studios | Zen Planner](https://zenplanner.com/blogs/best-pos-systems-for-boutique-fitness-studios) `tavily` - WellnessLiving also targets yoga studios, spas, salons, personal training, fitness gyms, pilates studios, and dance clubs with billing and reporting. - [Top Rated Fitness Software with Billing invoicing 2026](https://www.getapp.com/recreation-wellness-software/health-fitness/f/billing-invoicing) `tavily` - Gymdesk is being compared as a top billing app for fitness businesses, and Studio Director is described as generating invoices quickly and efficiently. - [Gym Billing Software: Comparing Top Platforms for Fitness Businesses](https://gymdesk.com/blog/gym-billing-software-compared) `tavily` - [Fitness Studio Management Software (Top Rated)](https://www.thestudiodirector.com/fitness-studio-management-software) `tavily` - On GitHub, FITNESSPLUS is a TypeScript gym membership system for tracking payments and invoicing, last pushed 2024-06-15, and Nexus is a standalone offline gym management tool last pushed 2025-12-12 that includes invoicing. - [stephentk/FITNESSPLUS](https://github.com/stephentk/FITNESSPLUS) `github` — 2024-06-15 - [SohamGanmote/nexus-gym-management](https://github.com/SohamGanmote/nexus-gym-management) `github` — 2025-10-12 - There are also smaller gym and fitness invoice projects on GitHub, including a gym-management API last pushed 2023-04-19, a family fitness gym app last pushed 2026-01-03, and a WordPress fitness invoice/payment package last pushed 2026-07-28. - [Emizy/fitness-club-manager-api](https://github.com/Emizy/fitness-club-manager-api) `github` — 2023-04-19 - [Gashie22/family-fitness-gym](https://github.com/Gashie22/family-fitness-gym) `github` — 2026-01-03 - [ncreighton/a96aaad0-fitness-wellness-invoice-and](https://github.com/ncreighton/a96aaad0-fitness-wellness-invoice-and) `github` — 2026-07-12 ## What people actually say *From data* - "Generic invoicing tools are not designed to handle this complexity, which can lead to errors and missed payments." Context: a page about invoicing for gyms and fitness trainers says the billing model is more complex than normal invoicing. - [Powerful Invoicing for Gyms and Fitness Trainers | Invoiv](https://invoiv.com/invoicing-for-gyms-and-fitness-trainers) `tavily` - "If your needs are book a client, bill them on a schedule, and get paid, a dedicated invoicing tool like WaffleInvoice will be faster to set up and significantly cheaper." Context: a comparison page argues that solo trainers want a narrower tool than full studio software. - [Best Invoice Software for Personal Trainers - WaffleInvoice](https://www.waffleinvoice.com/blog/best-invoice-software-for-personal-trainers) `tavily` - "Not all billing tools are built for fitness." Context: a fitness billing comparison page says studio billing has its own workflow requirements. - [Payments and billing software for boutique fitness studios | Zen Planner](https://zenplanner.com/blogs/best-pos-systems-for-boutique-fitness-studios) `tavily` ## People asking to be sold to *From data* - No first-hand buy signals were found in the collected signals. - [What invoice and payment systems do gyms use?](https://www.facebook.com/groups/109887915818714/posts/3742484819225654) `tavily` ## Where the opening is *Model estimate* - The signals do not show a clear gap for a generic invoicing app. The crowded space already includes full studio suites, gym billing products, and multiple open-source gym management systems. - [Powerful Invoicing for Gyms and Fitness Trainers | Invoiv](https://invoiv.com/invoicing-for-gyms-and-fitness-trainers) `tavily` - [Top Rated Fitness Software with Billing invoicing 2026](https://www.getapp.com/recreation-wellness-software/health-fitness/f/billing-invoicing) `tavily` - [Payments and billing software for boutique fitness studios | Zen Planner](https://zenplanner.com/blogs/best-pos-systems-for-boutique-fitness-studios) `tavily` - [Fitness Studio Management Software (Top Rated)](https://www.thestudiodirector.com/fitness-studio-management-software) `tavily` - [Gym Billing Software: Comparing Top Platforms for Fitness Businesses](https://gymdesk.com/blog/gym-billing-software-compared) `tavily` - [stephentk/FITNESSPLUS](https://github.com/stephentk/FITNESSPLUS) `github` — 2024-06-15 - [SohamGanmote/nexus-gym-management](https://github.com/SohamGanmote/nexus-gym-management) `github` — 2025-10-12 - The most plausible wedge is not invoicing alone, but fitness-specific billing rules: recurring memberships, class bundles, trainers, payment reminders, renewals, and possibly offline or WordPress-based deployment. - [Powerful Invoicing for Gyms and Fitness Trainers | Invoiv](https://invoiv.com/invoicing-for-gyms-and-fitness-trainers) `tavily` - [stephentk/FITNESSPLUS](https://github.com/stephentk/FITNESSPLUS) `github` — 2024-06-15 - [SohamGanmote/nexus-gym-management](https://github.com/SohamGanmote/nexus-gym-management) `github` — 2025-10-12 - [Gashie22/family-fitness-gym](https://github.com/Gashie22/family-fitness-gym) `github` — 2026-01-03 - [ncreighton/a96aaad0-fitness-wellness-invoice-and](https://github.com/ncreighton/a96aaad0-fitness-wellness-invoice-and) `github` — 2026-07-12 - [stevenmarp/sm_gym_management](https://github.com/stevenmarp/sm_gym_management) `github` — 2026-05-16 - [bpgit503/SyncSpace](https://github.com/bpgit503/SyncSpace) `github` — 2025-08-20 - The data does not show a product focused only on studio invoicing without the rest of membership or booking software, but the evidence is thin rather than conclusive. - [Powerful Invoicing for Gyms and Fitness Trainers | Invoiv](https://invoiv.com/invoicing-for-gyms-and-fitness-trainers) `tavily` - [Best Invoice Software for Personal Trainers - WaffleInvoice](https://www.waffleinvoice.com/blog/best-invoice-software-for-personal-trainers) `tavily` - [Payments and billing software for boutique fitness studios | Zen Planner](https://zenplanner.com/blogs/best-pos-systems-for-boutique-fitness-studios) `tavily` - [Fitness Studio Management Software (Top Rated)](https://www.thestudiodirector.com/fitness-studio-management-software) `tavily` - [Gym Billing Software: Comparing Top Platforms for Fitness Businesses](https://gymdesk.com/blog/gym-billing-software-compared) `tavily` ## How big the market might be *Model estimate* - This search found 23 live-ish projects or products touching fitness invoicing and billing, using the GitHub, registry, and web signals collected here. - [npm: @aws-sdk/client-invoicing](https://www.npmjs.com/package/@aws-sdk/client-invoicing) `registries` — 2026-07-31 - [docker: invoiceshelf/invoiceshelf](https://hub.docker.com/r/invoiceshelf/invoiceshelf) `registries` - [Powerful Invoicing for Gyms and Fitness Trainers | Invoiv](https://invoiv.com/invoicing-for-gyms-and-fitness-trainers) `tavily` - [npm: @substrat-run/engine-invoicing](https://www.npmjs.com/package/@substrat-run/engine-invoicing) `registries` — 2026-08-02 - [Best Invoice Software for Personal Trainers - WaffleInvoice](https://www.waffleinvoice.com/blog/best-invoice-software-for-personal-trainers) `tavily` - [stephentk/FITNESSPLUS](https://github.com/stephentk/FITNESSPLUS) `github` — 2024-06-15 - [Top Rated Fitness Software with Billing invoicing 2026](https://www.getapp.com/recreation-wellness-software/health-fitness/f/billing-invoicing) `tavily` - [Emizy/fitness-club-manager-api](https://github.com/Emizy/fitness-club-manager-api) `github` — 2023-04-19 - [Payments and billing software for boutique fitness studios | Zen Planner](https://zenplanner.com/blogs/best-pos-systems-for-boutique-fitness-studios) `tavily` - [SohamGanmote/nexus-gym-management](https://github.com/SohamGanmote/nexus-gym-management) `github` — 2025-10-12 - [Fitness Studio Management Software (Top Rated)](https://www.thestudiodirector.com/fitness-studio-management-software) `tavily` - [Gashie22/family-fitness-gym](https://github.com/Gashie22/family-fitness-gym) `github` — 2026-01-03 - [Gym Billing Software: Comparing Top Platforms for Fitness Businesses](https://gymdesk.com/blog/gym-billing-software-compared) `tavily` - [marildacaci/Reboot-Fitness](https://github.com/marildacaci/Reboot-Fitness) `github` — 2025-08-26 - [Time Tracking and Invoicing Software for Gyms - zistemo](https://zistemo.com/gyms) `tavily` - [XavierKain/solotrainer-packs](https://github.com/XavierKain/solotrainer-packs) `github` — 2026-03-13 - [The 5 Best Fitness and Wellness Billing Software](https://www.fitune.io/post/the-5-best-fitness-and-wellness-billing-software) `tavily` - [ncreighton/a96aaad0-fitness-wellness-invoice-and](https://github.com/ncreighton/a96aaad0-fitness-wellness-invoice-and) `github` — 2026-07-12 - [stevenmarp/sm_gym_management](https://github.com/stevenmarp/sm_gym_management) `github` — 2026-05-16 - [bpgit503/SyncSpace](https://github.com/bpgit503/SyncSpace) `github` — 2025-08-20 - The largest usage signal in the set is invoiceshelf/invoiceshelf, a Docker image with 603,882 pulls and 5 stars. - [docker: invoiceshelf/invoiceshelf](https://hub.docker.com/r/invoiceshelf/invoiceshelf) `registries` - The search found 1 first-hand complaint, 0 stated wants, and 0 unsolved questions, which means demand is being inferred from product listings more than from direct buyer voices. - [Hiring : AI Automation Engineer / n8n & AI Agent Developer](https://community.n8n.io/t/hiring-ai-automation-engineer-n8n-ai-agent-developer/294904/41) `discourse` — 2026-07-06 - [What invoice and payment systems do gyms use?](https://www.facebook.com/groups/109887915818714/posts/3742484819225654) `tavily` - The only community forum match named in the counted facts is community.n8n.io. ## What could go wrong *Model estimate* - A standalone invoicing product may be squeezed by all-in-one studio platforms that already bundle booking, memberships, reminders, and billing. - [Top Rated Fitness Software with Billing invoicing 2026](https://www.getapp.com/recreation-wellness-software/health-fitness/f/billing-invoicing) `tavily` - [Payments and billing software for boutique fitness studios | Zen Planner](https://zenplanner.com/blogs/best-pos-systems-for-boutique-fitness-studios) `tavily` - [Fitness Studio Management Software (Top Rated)](https://www.thestudiodirector.com/fitness-studio-management-software) `tavily` - [Gym Billing Software: Comparing Top Platforms for Fitness Businesses](https://gymdesk.com/blog/gym-billing-software-compared) `tavily` - [stevenmarp/sm_gym_management](https://github.com/stevenmarp/sm_gym_management) `github` — 2026-05-16 - [bpgit503/SyncSpace](https://github.com/bpgit503/SyncSpace) `github` — 2025-08-20 - The audience may prefer horizontal invoicing tools unless the product clearly handles studio-specific billing patterns better than generic tools. - [Powerful Invoicing for Gyms and Fitness Trainers | Invoiv](https://invoiv.com/invoicing-for-gyms-and-fitness-trainers) `tavily` - [Best Invoice Software for Personal Trainers - WaffleInvoice](https://www.waffleinvoice.com/blog/best-invoice-software-for-personal-trainers) `tavily` - Open-source and hobby projects show interest, but many are small or stale; several repos have only 1 star or were last pushed years ago. - [darrenirudyanathan/Fitness_website_frontend_with_login_AI_Interface_PDF_Invoice_Payment_portal_and_Youtube_interface](https://github.com/darrenirudyanathan/Fitness_website_frontend_with_login_AI_Interface_PDF_Invoice_Payment_portal_and_Youtube_interface) `github` — 2024-07-07 - [control-fitness/react-cf-component-crm-invoice-create](https://github.com/control-fitness/react-cf-component-crm-invoice-create) `github` — 2018-09-13 - [control-fitness/react-cf-component-crm-invoice-list](https://github.com/control-fitness/react-cf-component-crm-invoice-list) `github` — 2018-09-13 - [Emizy/fitness-club-manager-api](https://github.com/Emizy/fitness-club-manager-api) `github` — 2023-04-19 ## What to do this week *Model estimate* - Build around one narrow pain: recurring memberships plus class bundles plus trainer billing, not generic invoicing. - [Powerful Invoicing for Gyms and Fitness Trainers | Invoiv](https://invoiv.com/invoicing-for-gyms-and-fitness-trainers) `tavily` - [stephentk/FITNESSPLUS](https://github.com/stephentk/FITNESSPLUS) `github` — 2024-06-15 - [Payments and billing software for boutique fitness studios | Zen Planner](https://zenplanner.com/blogs/best-pos-systems-for-boutique-fitness-studios) `tavily` - [stevenmarp/sm_gym_management](https://github.com/stevenmarp/sm_gym_management) `github` — 2026-05-16 - Test whether solo trainers and small studios will pay for a faster, cheaper alternative to the suite products by comparing against WaffleInvoice, Zen Planner, and WellnessLiving. - [Best Invoice Software for Personal Trainers - WaffleInvoice](https://www.waffleinvoice.com/blog/best-invoice-software-for-personal-trainers) `tavily` - [Payments and billing software for boutique fitness studios | Zen Planner](https://zenplanner.com/blogs/best-pos-systems-for-boutique-fitness-studios) `tavily` - [Top Rated Fitness Software with Billing invoicing 2026](https://www.getapp.com/recreation-wellness-software/health-fitness/f/billing-invoicing) `tavily` - Validate the workflow with a prototype that imports clients, creates recurring invoices, sends reminders, and tracks missed payments; that matches the concrete complexity described in the signals. - [Powerful Invoicing for Gyms and Fitness Trainers | Invoiv](https://invoiv.com/invoicing-for-gyms-and-fitness-trainers) `tavily` - [stephentk/FITNESSPLUS](https://github.com/stephentk/FITNESSPLUS) `github` — 2024-06-15 - [SohamGanmote/nexus-gym-management](https://github.com/SohamGanmote/nexus-gym-management) `github` — 2025-10-12 - [Gashie22/family-fitness-gym](https://github.com/Gashie22/family-fitness-gym) `github` — 2026-01-03 - [marildacaci/Reboot-Fitness](https://github.com/marildacaci/Reboot-Fitness) `github` — 2025-08-26 - [bpgit503/SyncSpace](https://github.com/bpgit503/SyncSpace) `github` — 2025-08-20 ## Domain names - `fitnessgym.com` — taken - `fitnessgym.io` — available - `fitness.com` — taken - `getfitness.com` — taken --- Sources searched: hackernews (10), github (12), githubissues (none), discourse (1), intent (none), stackexchange (none), registries (9), tavily (10), devto (10) Generated by Shows Its Work — https://showsitsworks.com/idea/an-invoicing-tool-for-fitness-studios Findings link to their sources. Estimates are marked as estimates.