Diety
Don’t diet alone.

Log today’s weight together.

Diety is a simple shared journal for daily weight tracking. What’s hard to keep up with alone becomes easier with a partner, family, or team.

9 colors
TODAY MARI
62.4 kg
-0.3 kg

Slept well. Light breakfast 🍞

1 month Mari Ken Saki
🏃 Workout 🍶 Drinks 💕 Date
KEN

65.8 kg. Kept dinner light.

+3-day streak
Three-second logging · Stay with friends · Apple Health sync · Lovely graphs · Share logs in a Room · Invite by code · Log notes shared Three-second logging · Stay with friends · Apple Health sync · Lovely graphs · Share logs in a Room · Invite by code · Log notes shared Three-second logging · Stay with friends · Apple Health sync · Lovely graphs · Share logs in a Room · Invite by code · Log notes shared Three-second logging · Stay with friends · Apple Health sync · Lovely graphs · Share logs in a Room · Invite by code · Log notes shared Three-second logging · Stay with friends · Apple Health sync · Lovely graphs · Share logs in a Room · Invite by code · Log notes shared Three-second logging · Stay with friends · Apple Health sync · Lovely graphs · Share logs in a Room · Invite by code · Log notes shared
A story

01 — Why

Dieting alone is hard.

You start strong and stop after three days. With no one watching, the scale becomes scary, and skipping is easier. Diety quietly untangles that loneliness. For couples, best friends, families, work teams. Just having someone to share the small ups and downs with can be enough to keep going.

「Just stepping on the scale today deserves full marks.」
— Diety
「Up or down, log every single day.」
— Diety
How it works

Three steps. Start today.

  1. 1 STEP 01

    Create a Room

    For couples, friends, teams, clubs. Spin up a private room of up to 20 people with a single invite code.

    a private room
  2. 2 STEP 02

    Send the invite

    Drop the link in chat or email. When they tap it, they’ll join the Room, and a personal color will be assigned automatically.

    DIETY-A8KQ
  3. 3 STEP 03

    Three seconds a day

    Just type the number. Add a stamp and a one-liner to capture the mood. Auto-import from Apple Health is optional.

    tap · type · done
Features

Small features. Just enough.

Designed around only what you need to keep going.

  • / 01

    Log weight & body fat, fast

    One tap on the calendar. Stamps (workout, date, party…) and a short note keep the context, not just the number.

  • / 02

    Graphs that show progress

    Switch between 1 month, 3 months, and all time. Show everyone’s progress together and compare members with color-coded lines.

  • / 03

    A space called a Room

    Up to 20 members, invite-only. Personal colors make chart lines and shared log notes easy to tell apart. Private and safe.

  • / 04

    Share notes from each log in your Room

    There is a chat-style feed, but not a free-form composer. The stamp and short note attached to each daily log are what appear in the Room.

  • / 05

    Apple Health, in sync

    Smart-scale numbers and Health entries flow into Diety automatically. Zero typing if you want.

  • / 06

    A gentle reminder

    Set a time. Diety quietly nudges you: "Forgot today’s log?"

Room examples

What does your Room look like?

Couples, families, best friends, coworkers. Nine member colors make everyone easy to recognize.

Until Ringo’s wedding

4 members · -2.8 kg

  • R
  • M
  • K
  • S

Just the two of us

2 members · -3.1 kg

  • A
  • B

Dad’s diet club

3 members · -1.4 kg

  • D
  • C
  • M

Marathon circle

8 members · +0.2 kg

  • A
  • B
  • C
  • D
  • E
  • +3
Shared log notes

Log notes keep you going.

This screen is not for posting free-form chat. What appears here are the stamp and short note attached to each weight log, shared with the Room.

today · 20:14
Mari added today’s log
62.4 kg today. Back in the 60s after last night.
M
K
58.1 kg. Morning run done, feeling good.
S
Down 0.2 kg from yesterday. Skipped the late snack.
-1.2 kg this week

Simple, but solid.

  • / 01
    3 sec

    Average taps to log = 1. Fits even the busiest morning.

  • / 02
    20

    People in a single Room. From a couple to a work team.

  • / 03
    9

    Member identity colors. You see at a glance whose line is whose.

FAQ

Everything you might wonder.

  • Q01

    Is it free?

    Yes. All core features are free. Ads are kept light.

  • Q02

    Can I use it on my own?

    Of course. Use the calendar and graphs by yourself, then invite anyone whenever you’re ready.

  • Q03

    Where is my data stored?

    On Firebase, encrypted. Only the people in your invited Room can see your logs.

  • Q04

    Is Apple Health required?

    No. It’s optional. When connected, smart-scale numbers and Health entries auto-import.

  • Q05

    Can I delete my account?

    Anytime, from the in-app settings. Please review the Privacy Policy for how data is handled when an account is deleted.

Let’s start

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