
SquadPrime
App Cost Calculator
MVP-Challenge
WIP.co
Estimapp
Offshore Development Cost Calculator
Makerlog
A structured 13, 21 or 30-day sprint for developers with a full-time job whose side project is stuck. Daily prompts calibrated to your project, and at each milestone a human reads what you delivered before the sprint continues.

Gyroscope
Daylio
Bearable App
Habitica
Streaks
Everyday
HabitBull
Track everything in one place, understand your life.

Which is more popular?
Based on our record, Exist seems to be more popular. It has been mentioned 43 times since March 2021.
Website, pricing, platforms and company facts side by side.
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|---|---|---|
| Website | mvpbuilder.io | exist.io |
| Pricing | — | |
| Company | Startup from Switzerland · 1 - 9 employees · 2026 | — |
| Listed in |
In their own words, as submitted to SaaSHub.


Most side projects don't fail because the developer isn't good enough. They fail because there's no structure, no real deadline, and nobody watching when you skip Day 4. MVP Builder is a structured 13, 21 or 30-day sprint for developers with a full-time job whose side project is stuck. Not a...
No description of Exist yet.
What each product offers, as listed by its team.


Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
No analysis of Exist yet.
Walkthroughs and reviews on video.
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Exist - Board Game Review
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing MVPBuilder.io and Exist.
MVPBuilder.io's answer
Next.js, Supabase, Vercel
MVPBuilder.io's answer
AI will give you a plan in ten minutes and will not notice when you skip Day 4. What is missing is not another plan, it is a checkpoint someone else reads. The daily prompt is calibrated to your own project context rather than generic advice, and the decision to take you on is made in a call, not by a form — vague scope gets turned down there, because a sprint that starts wrong produces nothing worth showing.
MVPBuilder.io's answer
Developers with a full-time job and a side project that has been almost done for months. Not beginners, not people looking for someone to build it for them. The requirement is that you own the implementation and can put three to five hours a week into it, spread across several days rather than in one block.
MVPBuilder.io's answer
The milestone is enforced, not tracked. On day 13, 21 or 30 you attach a URL or a file, and a person reads it against a goal that was written down before day one and frozen. No proof, no continuation: the sprint pauses. Everyday check-ins stay voluntary on purpose — the point is not attendance, it is that something exists at the checkpoint.
MVPBuilder.io's answer
MVPBuilder.io's answer
I built the enforcement first and then ran it on myself: a 21-day sprint as a participant, with the goal written down and frozen before day one. I missed one of my four criteria and published that alongside the three I met. The product exists so that every participant gets the same setup: a goal frozen before day one, and proof at each milestone that a human reads.
Share your experience with using MVPBuilder.io and Exist. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.


Tracking MVPBuilder.io since Apr 2026.
As someone who has been on and off the Degoogle train (I ran full LineageOS without Google Play at one point) and is now pretty deep in iOS territory, I'd say the main thing for me has been email. I've used https://www.fastmail.com for a... - Source: Hacker News / almost 2 years ago
You may want to look into https://exist.io/. It's a very indie developer duo out of Australia (IIRC). And also IIRC they were looking for a buyer on Twitter some time ago. - Source: Hacker News / about 3 years ago
I have used this previously when tracking health metrics and I couldn't much else that had integrations. https://exist.io/. - Source: Hacker News / about 3 years ago
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