Petites apps, faites main.

Small apps, made by hand.

I'm Theo and I build apps. Each one does something I've always wanted: slow down a solo until I can play it, log a run and see the science behind every number, keep my habits honest, share photographs without the endless scroll and heat a magnet until its order melts. None of them run ads, sell your data or count how long you stayed.

See the apps

La vitrine

In the window today.

Ouvert

Slow Down

Slow down and practice.

Slow any song down until you can hear every note, then loop the part you keep missing. Learn your scales, write down the solo you just worked out and send it to a friend. It's free, and supporters keep it running.

Visit slowdownpractice.com
La carte du jour

Slow Down

Slow down and practice.
- Slow it down inclus
  
  Take any YouTube video or your own recording down to quarter speed.
- Loop the hard part inclus
  
  Mark the bar you keep missing and play it until it's easy.
- Learn your scales inclus
  
  Scales, rhythms, a metronome and a tuner in the same tab.
- Write down the solo inclus
  
  Put the part you just figured out into notation before you forget it.
- Share it with friends inclus
  
  Send your loops and playlists to a friend or your teacher.
- Tempo and key inclus
  
  It tells you the BPM and the key so you can play along.
- Pitch shift inclus
  
  Move a song up or down to suit your voice or your tuning.
- Browser extension inclus
  
  For Chrome and Firefox.
Slow Down's home page, signed out
Visit slowdownpractice.com
No ads, no tracking, made by hand.
Ingrédients

Hand-rolled Ruby, free-range JavaScript, audio slow-fermented for 48 hours. May contain traces of jazz.
Non-GMO

Grass-fed

Small batch

Sans gluten
Ouvert

negativve

Share art and photography and find inspiration, without the endless scroll.

A community for film shooters and darkroom regulars, street and portrait photographers, painters and illustrators. Follow people whose eye you admire, take on a 365 challenge and open the daily print for a piece of art picked from a museum collection.

Visit negativve.com
La carte du jour

negativve

Share art and photography and find inspiration, without the endless scroll.
- The daily print inclus
  
  We pull thousands of artworks and prints from museum collections like the Met, Paris Musées and Gallica, and pick a few each day to inspire you.
- Your feed inclus
  
  The people you follow. Nothing else.
- Explore inclus
  
  A new mix every visit, full of people you wouldn't come across anywhere else.
- Projects inclus
  
  Build a body of work instead of a grid.
- The 365 challenge inclus
  
  Post every day for a year and keep yourself honest.
- Every kind of image inclus
  
  Photography, illustration, painting and digital art.
negativve's Explore page
Visit negativve.com
No ads, no tracking, made by hand.
Ingrédients

Pasture-raised pixels, organic silver halide, cold-pressed JPEGs. May contain traces of mustache.
Non-GMO

Grass-fed

Small batch

Sans gluten
Ouvert

quotidienn

Keep track of your goals beautifully.

A daily habit tracker that asks for a name and, if you like, a number of minutes. Run a timer, keep a streak and see what your hours add up to over the weeks. Everything else stays out of the way until you go looking for it.

Visit quotidienn.com
La carte du jour

quotidienn

Keep track of your goals beautifully.
- Tick it or time it inclus
  
  Some habits are a tick. Others get a goal and a live timer.
- Log it after inclus
  
  Forgot the timer? Write down the forty minutes you already spent.
- Daily or weekly goals inclus
  
  Three hours a week absorbs a busy Tuesday.
- Forgiving streaks inclus
  
  A streak only breaks once the day is over.
- Patterns inclus
  
  See where your hours actually went across the weeks.
quotidienn's home page, signed out
Visit quotidienn.com
No ads, no tracking, made by hand.
Ingrédients

Grass-fed minutes, heirloom hours, a sourdough streak starter. Non-GMO.
Non-GMO

Grass-fed

Small batch

Sans gluten
Ouvert

cadennce

Running data, with the science behind every number.

Every metric shows where it comes from and how strong the evidence is. Connect Strava or Garmin, then map your town to see every street you've run and the ones still waiting for you.

Visit cadennce.com
La carte du jour

cadennce

Running data, with the science behind every number.
- Sources for every metric inclus
  
  Tap the question mark on any number to read the papers behind it.
- Honest about the evidence inclus
  
  Peer-reviewed, empirical estimate, coaching rule of thumb or contested. Each number says which.
- Explore your area inclus
  
  Your town's streets and trails from OpenStreetMap fill in as you run them.
- Where to go next inclus
  
  Set an exploration goal and get routes toward the streets you haven't run yet.
- Strava and Garmin inclus
  
  New runs arrive on their own. You sign in on their site, never here.
- Race pacing inclus
  
  A kilometer-by-kilometer plan for your goal race.
cadennce's home page, signed out
Visit cadennce.com
No ads, no tracking, made by hand.
Ingrédients

Peer-reviewed metrics, locally sourced streets, single-origin heart rates. May contain traces of red wine.
Non-GMO

Grass-fed

Small batch

Sans gluten
Au four

downbbeat

Scheduling for music schools.

Lessons, rooms, instrument rentals and invoices in one place, so a parent can book a lesson without calling the front desk. It isn't ready yet. Check back when it's out of the oven.

downbbeat.com, soon
La carte du jour

downbbeat

Scheduling for music schools.
- Lessons and classes bientôt
  
  One-to-one, groups and the weekly regulars.
- Rooms bientôt
  
  Two lessons never land in the same room at the same time.
- Attendance bientôt
  
  One tap per student.
- Instrument rentals bientôt
  
  Who has which cello and since when.
- Invoices bientôt
  
  Billing that matches the lessons that happened.
Au four
downbbeat.com opens when it's ready.

No ads, no tracking, made by hand.
Ingrédients

Still proving. Ingredients pending inspection by the Préfecture.
Non-GMO

Grass-fed

Small batch

Sans gluten
Ouvert

order by disorder

A physics lab in a browser tab.

Run simulations, work problems, keep notes and read the night sky, organized the way universities teach physics. Every simulation cites the papers it's built on. On the front page you can heat a magnet and watch its order melt.

Visit orderbydisorder.com
La carte du jour

order by disorder

A physics lab in a browser tab.
- Open labs inclus
  
  No account needed. Heat the Ising model and watch it melt.
- Courses inclus
  
  Mechanics, quantum mechanics, thermodynamics and astronomy.
- Problems inclus
  
  Worked through section by section with checked answers.
- Notes and flashcards inclus
  
  Keep what you learn where you learned it.
- The night sky inclus
  
  Exoplanets from the NASA archive, each with its reference.
- Sources, always inclus
  
  Every simulation cites its papers. Nothing comes from AI.
order by disorder's front page with the live Ising model
Visit orderbydisorder.com
No ads, no tracking, made by hand.
Ingrédients

Free-range electrons, ethically frustrated magnets, small-batch entropy. Contains no AI.
Non-GMO

Grass-fed

Small batch

Sans gluten

Le manifeste

Two ways to make software.

Le supermarché

La boutique

Chez eux:

Chez nous: You're the customer.
Chez eux:

Chez nous: The page ends. Go outside.
Chez eux:

Chez nous: No pings unless you asked for them.
Chez eux:

Chez nous: Your data stays here. Nobody's buying it.
Chez eux:

Chez nous: You can leave whenever you like.
Chez eux:

Chez nous: One person who uses these apps too.
Chez eux:

Chez nous: Small on purpose.

Réglages

Your settings. Some aren't up for negotiation.

Big apps hide the bad switches six menus deep and flip them back on with every update. Here they're right on the front page, and they don't move.

Objets trouvés
Empty. Marketing calls this untapped potential.
Tap the jar to shake it. Shaking counts as an interaction.

Sell my data

To anyone with a credit card.
Infinite scroll

Keep me here until 3am.
Personalized ads

Based on that thing you said out loud once.
Streak guilt

Make me feel bad about missing a day.
Fait main

Every app built by hand, by one person.
Pasture-raised pixels

They roam free on a small farm in Normandy.
Small-batch JavaScript

Hand-poured in tiny batches. Takes forever.

Pourquoi deux n?

Why the double letters?

Most of the house names carry a doubled letter. It's my maker's mark, and the normal spellings were taken anyway. Slow Down and order by disorder are the exceptions. Their names were long enough.

Press a name.

L'artisan

Who makes all this.

I'm Theo Wecker. I studied quantum mechanics and magnetism, then left physics to write software so I could live in the mountains and run in circles all day. I also play music and take photographs. Slow Down started as a tool for my own practice, and most of the others started the same way: something I wanted, built properly, then opened up to everyone else.

My own site has more about me and how to reach me.

Visit theowecker.com