TendoGet lifetime — $97
Become a Founding Member — $97
FOUNDING MEMBER LAUNCH · LIFETIME $97

Habits that bend
instead of break.

Every other habit app runs on streaks — miss one day and you're back to zero. Tendo borrows Strava's training model instead: your habits build strength over six weeks and gently weaken when life gets in the way. Never a reset. Never the shame spiral. And an AI companion reads your sleep, energy and mood — then tells you exactly what to protect today and what's okay to skip.

Become a Founding Member — $97 for lifeSee how it works ↓
One payment. Yours forever. 30-day "Weakened, Not Ruined" guarantee.
Friday · June 12
Hello, Gedas 👋
73
Today's plan, explained
Capacity
Sober focus blockProtect
Your keystone — 5 days strong. Protect it.
Morning sunlight walkProtect
Cheap win, big mood payoff on a tired day.
Long runDefer
Low sleep last night — fine to defer today.
Morning sunlight walk
Daily growth · 10 min
Cold water & breathing
Non-negotiable · 2 min
Sports — move the body
Non-negotiable · 20 min

There are two kinds of people who try to change their lives.

The first treat one missed day as proof they've failed — and quietly quit by Wednesday.

The second know that consistency was never about being perfect. It's about what you do after the miss.

If you're still reading, you're already the second kind. Tendo was built for you.

Why you keep starting over

It was never your willpower. It was the on/off switch.

If you're like most people, you've started — and abandoned — the same handful of habits more times than you'd like to admit. Not because you're lazy. Because every tool you tried only knew two states: done, or broken.

Sound familiar?

You start strong, miss one ordinary day — travel, a deadline, a cold — and the counter drops to zero.
The “zero” whispers what's the point, and within a week the app is deleted.
You blame your discipline, when the truth is your tracker punished a completely normal life.
Five half-used habit apps, three abandoned journals, and the quiet suspicion that maybe you're “just not disciplined.”
The wall of broken streaks
Meditate41 days0
Gym23 days0
Read67 days0
Journal12 days0
+ the ones you'd rather not look at.

Here's what no one tells you: the streak counter — the thing every habit app is built around — is quietly the reason you quit.

The science is in

Perfect was never the point.

For decades, "building habits" meant white-knuckling it and hoping you didn't slip. Decades of behavioral research show that's backwards — it isn't the slip that beats you, it's how your tools make you read it.

The "what-the-hell effect"

Psychologists named it back in 1975: cross your own line once, and the mind reframes the whole effort as blown — so you abandon it. A broken streak is a textbook trigger.

Herman & Mack, 1975

All-or-nothing thinking

The biggest predictor of who quits isn't willpower — it's how you read a lapse. People who see a slip as "ruined" abandon the goal; people who treat it as a normal blip keep going.

Byrne, Cooper & Fairburn, 2004; Parke, Eschle & Keatley, 2022

1 missed day ≈ no setback

In UCL's landmark habit study, missing a single day didn't measurably slow habit formation — automaticity simply resumed. What prevents habits is chronic inconsistency, not the occasional miss. Consistency, not perfection.

Lally et al., 2010 — UCL

Every streak app is built on the exact mechanism the research says makes you quit. Tendo is built on the opposite — plus an AI that paces you, so a slip stays a slip. The willpower era is ending.

The Tendo difference

Introducing Habit Fitness — train your habits like an athlete, not a prisoner.

Strava revolutionized training by tracking two things: how fit you're getting, and how fresh you are today. Tendo applies that exact model to your habits — for the first time.

1

Strength, not streaks

Every habit has a living strength score. Do it and strength rises. Over about six weeks it becomes ingrained — you can literally watch the willpower it costs you fall.

2

Weakened, not ruined

Miss a day and strength dips slightly, then recovers. It never resets to zero. A bad week is a dip in the curve, not the end of the story.

3

Paced, not punished

Your AI Pacer reads your sleep, energy and mood, sizes up today's capacity, and tells you what to protect and what's okay to defer. Smaller plan on hard days. You keep going.

"A missed day should be a dip — not a defeat."

Try itThe Miss-a-Day demo — same month, two completely different stories
Tap any day to toggle it (done ↔ missed)
A streak app3 fresh starts
5 day streak
One miss and you're back to zero.
TendoBecoming ingrained · willpower low
83% strength
Weakened, not ruined.
Same 28 days, same 4 missed. The streak app records 4 failures and leaves you on day 5. Tendo records one 83%-strong habit, still climbing.
Sober focus block
Habit strength · 8 weeks
Willpower cost: low ↓
73%ingrained
On vacation: weakened, not ruined
Fitness (strength) Freshness Form
Watch a habit become effortless

Drag the weeks — the strength climbs, the "ingrained" meter fills, and the willpower it costs you drops away.

Weeks of practice1 week
08
27%ingrained
Willpower cost: High
Week 1: every rep is a decision. This is the hardest stretch.
Same missed days. One visual tells the whole story.
The streak wayday 0 · again
One miss and you're back to zero.
The Tendo way73% · climbing
Weakened, not ruined.

Then it paces you through the day.

Drag "How's today?" and watch the plan re-sort itself — in real time.

Today's plan, paced to you
Capacity
Moderate day. Hold your anchors, add one stretch habit.
How's today?Good
WipedGreat
Protect · do even today
Sober focus block
Your keystone — protect it even today.
Move the body
20 minutes resets everything else.
Cold water & breathing
Two minutes. Cheap and steadying.
Read 10 pages
Low effort, quietly compounding.
Defer · okay to skip
Call a friend
No pressure to reach out today.
Long run
Low sleep — okay to defer.
Why I built this
GA note from the founder

I'm Gedas. I grew up in Lithuania — for years, top three in the world for drinking. Where I'm from, kids start at fourteen and nobody calls it a problem. By seventeen I couldn't picture a Friday without it.

When I finally tried to change, I did it the way everyone tells you to: willpower and a clean streak. Three months sober — then one slip — then "what the hell" — then all the way back to zero. The reset erased everything, every time. It took me the better part of eight years to understand why.

It was never about willpower. What actually worked was environment, pacing, and forgiving the slip instead of letting it erase me. The day I stopped treating one bad night as total failure was the day it finally stuck. Today I'm around five years free, I do CrossFit, and my head is clear.

Then I went looking for an app to help me build the rest of my life the same way — and every single one did the opposite. Miss a day? Back to zero. The same trap that kept me stuck for eight years, now in my pocket, buzzing.

So I built the one I needed at seventeen. Tendo is the habit companion that paces you like a coach and forgives you like a friend — because that's the only thing that ever actually worked.

— Gedas, founder of Tendo
One calm system for your whole life

Capture → Understand → Guide → Reflect

1

Capture

Track four life areas — non-negotiables, daily growth, things to avoid, and relationships — plus mood, focus and sleep. Connect Strava, Apple Health, Screen Time and your calendar so most of it fills itself in. Track more, tap less.

2

Understand

Habit Fitness turns all that into a living picture: what's becoming ingrained, what's fragile, and where your energy really goes.

3

Guide

capacity

Each morning your AI Pacer hands you a realistic plan sized to today's capacity — what to protect, what to let go.

4

Reflect

Weekly review

Gentle check-ins, a voice journal, and a weekly review close the loop — so next week is a little wiser than this one.

MoodCyclePartnerJournalFocusBreathingTo-dosProjectsGoals

The difference you'll feel on your first bad day.

Streak apps
Miss a day → streak resets to 0 → you quit
Same demand on your hardest day
Motivated by fear of breaking the chain
Static checkboxes
Habits only
“Don't break the chain!”
Tendo
Miss a day → strength dips and recovers → you keep going
AI paces you to today's real capacity
Motivated by watching a habit become effortless
Reads your sleep, energy, mood & cycle
Your whole life, one calm place
“Weakened, not ruined.”
What people are saying

Tendo is brand new — these are our founding members. The science behind it isn't new at all.

Your story here
Founding member

The first founders are just starting their journeys — real quotes will land right here as they come in.

Your story here
Founding member

The first founders are just starting their journeys — real quotes will land right here as they come in.

Your story here
Founding member

The first founders are just starting their journeys — real quotes will land right here as they come in.

Built onStrava's training modelThe “what-the-hell effect” (Herman & Mack, 1975)UCL: one missed day ≈ no setback (Lally, 2010)
The Founding Member deal

Everything in Tendo. Once. For life.

Five core pieces, plus three Founders'-round bonuses — engineered to take you from "I always quit" to "I actually kept it."

Tendo Lifetime
Every tab, every life area, forever. No subscription, ever.
$497
The Habit Fitness Engine
Strength, Freshness & Form + AI daily pacing. The part no other app has.
$180
AI Pacing Companion
Five personas, Quick & Deep thinking, plus 500 founding credits to start.
$60
The Whole-Life OS
Mood, cycle, partner sync, voice journal, focus, breathing, to-dos, projects, goals. Replaces 4–5 apps.
$200
Auto-tracking Integrations
Strava, Apple Health / Google Fit, Screen Time, Calendar. Track more, tap less.
included
Bonus — Bring-Your-Own-Key, free forever
Run Tendo's AI on your own API key and never pay us for AI.
$120
Bonus — Every future feature, free forever
Lifetime means lifetime.
$300
Bonus — Founding Member status
A locked-in rate, a founder's badge, and a vote in the Founders' Circle on what we build next.
exclusive
Total value~$1,357
Lifetime normally $497
$97
one-time · yours forever · 500 AI credits included
500 AI credits included
Become a Founding Member — $97
30-day guaranteeOne payment, no subscriptionBring your own AI key, free

After your 500 credits, keep going your way: top up anytime, or connect your own API key and run Tendo's AI free, forever. We'll never hold your AI hostage.

30-day guarantee

The "Weakened, Not Ruined" Guarantee

Use Tendo for 30 days. Let it pace you through at least one ordinary bad week. If your habits don't feel genuinely easier to keep — if you don't feel the difference — email us and we'll refund 100%. Keep your Founding Member status anyway, as our thank-you for giving it a real try. The only risk here is staying stuck.

The Founders' round is limited

Why this price exists — and why it won't last.

Lifetime access at $97 is a founding offer, not a forever one. We're opening it to the first 500 founders to fund the build and shape the roadmap with real users. When the round closes, Tendo becomes a monthly subscription and the lifetime door closes for good. This isn't a fake timer — it's the one moment to own Tendo outright.

Founding seats remaining363 / 500
Founders' round closes in
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Questions, answered.

Nothing breaks. Your habit's strength dips a little and starts recovering the next time you show up. That's the entire point of Tendo — a missed day is a dip, never a reset.
No. Start with a few habits in one or two life areas; Tendo hides the advanced tabs until you want them. Connect Strava, Apple Health or your calendar and a lot of it fills itself in.
They're the fuel for your AI companion and daily pacing — enough to comfortably feel the magic for your first month-plus. After that you can top up, or connect your own API key and run Tendo's AI completely free, forever.
Yes. One payment, lifetime access, every future feature included. No subscription, ever — that's the whole point of the Founders' round.
No. Every other app is built on streaks that reset and shame you. Tendo is built on Habit Fitness — strength that bends instead of breaks — plus an AI that paces you to your real capacity. It's a different model, not a different skin.
Yes. Your journal, mood and cycle data are yours. You can export or delete them at any time, and we never sell your data.
Tendo runs in any modern browser, on desktop and mobile, and it's designed to be used one-handed on a phone.
Then you're exactly who this is for. Tendo assumes you'll miss days — it's designed around the comeback, not the perfect run.

Thirty days from now, you'll have missed a day either way.

The only question is what that missed day costs you. In every other app, it ends your streak — and usually your progress with it. In Tendo, it's a dip you'll barely notice on a curve that keeps climbing. One path leaves you back at zero by next month. The other leaves you a month stronger, paced through the hard days, finally believing you can keep what you start.

Back at zero
A month stronger

Founding Member — lifetime Tendo for $97. 500 AI credits included. Backed by the 30-day "Weakened, Not Ruined" guarantee.

Yes — make me a Founding Member for $97

P.S. You've already tried doing it the all-or-nothing way — more than once. You know how that ends. Tendo is the first tool that's on your side on the days you miss. That's the day everything usually falls apart. It's the day Tendo is built for.