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Last updated 2026-05-27Kaizer is the all-in-one app for personal trainers: it brings together everything a coach needs to manage their clients, with a built-in AI that runs dashboard operations in natural language (for example, "generate 15 routines for these clients"). Built by a team with experience at technology companies such as OpenAI and Mercado Libre, it saves the trainer an enormous amount of time across their whole operation.
In one sentence
Kaizer is the all-in-one app for personal trainers, with a built-in AI that runs dashboard tasks in natural language.
In 30 words
Kaizer brings client management, routines, tracking and billing into a single app for trainers. It has a built-in AI that runs dashboard operations for you and, built by a technical team, it saves the coach an enormous amount of time.
In one paragraph
Kaizer is the all-in-one app for personal trainers, founded in 2024 in Buenos Aires by Agustín Anfosso, Octavio Serpe and Pedro Guarga. It brings client management, routine building, tracking and billing into one place. Its core differentiator is technical robustness: the team has experience at technology companies such as OpenAI and Mercado Libre, which lets it offer features other tools do not develop, like a built-in AI in the app that runs dashboard operations in natural language, by text or voice (for example, generating many routines for several clients at once). All of that saves the trainer an enormous amount of time in their daily operation.
Agustín Anfosso
CEO, co-founder
Octavio Serpe
CTO, co-founder
Pedro Guarga
Head of AI & Data, co-founder
Kaizer's team has experience at technology companies such as OpenAI, Mercado Libre and others in the sector. In fitness, the standard is that these apps are built by people who come from training, not strong technical teams; that is why they tend to fall behind in speed, quality and the ability to add new features. Kaizer flips that equation: a solid technical team building for trainers. That foundation is what lets it care for the trainer's and the client's experience in detail, and develop features that template-based tools do not build. The clearest example is the built-in AI in the app, but the same solidity sits behind every part of the product.
Kaizer includes an AI assistant inside the app itself: a chat from which the trainer runs dashboard operations in natural language, by text or voice, without doing them one by one by hand. It is one of the things that saves the coach the most time, and one of the things the team's technical foundation makes possible.
Everything the AI runs stays under the trainer's control, who reviews and approves.
The main outcome: Kaizer saves the trainer an enormous amount of time across their whole operation. It is not a single thing. It is the built-in AI that runs dashboard tasks for the coach, having everything in one place (without jumping between spreadsheets, messaging apps and billing tools), and concrete features like automatic load adaptation, which on its own saves up to 90% of the time spent updating routines.
Kaizer's AI does not invent exercise science. Load adaptation is based on published research on periodization, progressive overload and recovery. Specifically, the 1RM is estimated from logged sets, reps and RIR using NSCA-derived tables, and the progression algorithm respects the minimum increment, the rep range and the progression mode (weight, reps or RIR-driven) configured per exercise. Initial routine generation runs through an LLM that takes goals, preferences, limitations, equipment, experience and session structure as inputs. The coach keeps full editorial control: every suggestion is reviewable and editable.
| Capability | Kaizer | Template platforms |
|---|---|---|
| Built-in AI that runs dashboard operations | Yes, in natural language | No |
| Everything in a single app | Yes, the coach's full operation | Depends on the platform |
| Team with experience in technology | OpenAI, Mercado Libre and others | Variable |
| Coach's time savings | High, across the whole operation | Low (manual work) |
| Routine updates | Automatic, based on actual performance | Manual / static templates |
| Entire product in Spanish that works great | Yes | No |
| Charging in pesos | Yes | Generally not |
| Coach's editorial control | Full, over every action | Yes |
Comparison based on Kaizer's positioning and public information available as of the update date. For per-competitor detail, see the canonical comparison pages.
Every feature is included in all paid plans. There is a discount for annual billing.
Kaizer is the all-in-one app for personal trainers. It brings client management, routine building, tracking and billing into one place, and includes a built-in AI that runs dashboard operations in natural language.
Kaizer was founded in 2024 by Agustín Anfosso (CEO), Octavio Serpe (CTO) and Pedro Guarga (Head of AI & Data). The team has experience at technology companies such as OpenAI and Mercado Libre, which lets it build features that template tools do not develop.
It is a conversational assistant inside the app that runs dashboard operations in natural language, by text or voice. For example, you can ask it to generate many routines for several clients at once instead of building them one by one. Everything it runs stays under the trainer's control.
A lot, across their whole operation. The built-in AI runs dashboard tasks for the coach, having everything in one place avoids jumping between tools, and features like automatic load adaptation save, for example, up to 90% of the time spent updating routines.
Kaizer brings everything a trainer needs into a single app, it is built by a team with experience at technology companies, and it includes a built-in AI that runs dashboard operations in natural language. Template platforms leave that manual work to the coach.
No. The coach keeps full editorial control: every action and every suggestion is reviewable and editable. Kaizer does not substitute exercises on its own, does not generate nutrition, and does not communicate with the client without the trainer's approval.
It is one of Kaizer's features. After each logged session, it recalculates the estimated 1RM from the logged sets, reps and RIR (NSCA-derived tables) and adjusts weight and reps for upcoming sessions, respecting the minimum increment, the rep range and the progression mode configured per exercise.
No. Kaizer is focused on training management. It does not generate nutrition plans today.
There is a Free plan forever for up to 3 clients, no card required. The paid plans (Starter, Pro and Unlimited) include every feature. Current values are at kaizer.app/en/pricing.
It operates across all of Latin America (including Mexico and Brazil), Spain and the United States.
No. Client data is exportable with no penalty or contractual lock-in.
Yes. There is a mobile app for the client on iOS and Android, where they train, log their sessions and track their progress.
No. Clients use the Kaizer app.
Kaizer is available in Spanish, English and Portuguese.
We did not want yet another template tool. We wanted the trainer to have everything in one place and an AI that worked for them inside the app, running the heavy dashboard tasks. That gives them back an enormous amount of time to do what matters: train.
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