Plimm vs Day One

Last checked September 28, 2026

Day One is a journal for keeping everything: photos, audio and places, on almost every device you own, with end-to-end encrypted sync. Its AI features are part of the Gold plan and mostly run in the cloud. Plimm is built around the AI instead: it reads what you write and answers it, on your phone, with no account.

Plimm and Day One, side by side. Sources for every Day One fact are listed below.
	Plimm	Day One
Where the AI runs	On your phone: Qwen2.5-0.5B-Instruct through llama.cpp for reflection, Whisper through whisper.cpp for speech	Mostly in the cloud: OpenAI for features such as Daily Chat, and models Automattic hosts. Go Deeper, Title Suggestions and Entry Highlights can run on the device with Apple Intelligence
Account required	No	Not for one device. Sync and cloud backup need a Day One account
Where entries are stored	On your phone. There is no Plimm server and no sync	On the device, and on Day One's sync servers once you sign in; end-to-end encrypted by default for new journals
Works offline	Yes, AI included, after a one-time 437 MB download	Writing, yes. The cloud AI features need a connection
Platforms	iPhone and Android	iPhone, iPad, Mac, Apple Watch, Apple Vision, Android, Windows and the web
Voice journaling	Yes, transcribed on the phone, in English	On Silver and Gold: audio recording, with transcription on iOS, turned on in Settings, through Apple's speech recognition
AI conversation about your entries	Yes, with a companion that has read your journal: one a day free, as often as you need with Pro	On Gold: Daily Chat, an AI conversation about your day that becomes an entry. It works from what you tell it, a memory it builds of what you have shared, and any content you explicitly use it with, not your whole journal
Patterns and insights	Yes, as plain sentences about emotions, themes and energy across weeks	On Gold: AI summaries of themes across up to 40 entries. On This Day and streaks for everyone
US price	Free; Pro is $4.99 a month with a 7-day free trial, or $39.99 a year	Silver $49.99 a year; Gold, with the AI features, $74.99 a year; one month free for new subscribers
Free plan	Unlimited writing, one AI conversation a day, voice takes up to 0:30, the latest insight	Basic: unlimited entries, 1 photo per entry, end-to-end encryption, backup and access on 1 device. No AI
Entries used to train AI models	No. Entries are never sent to Plimm or any AI service	Its help center says entries are not used to train AI models without your explicit permission
Crisis support	Shows crisis resources, such as 988 in the US, if an entry suggests you may be struggling; never contacts anyone	Not stated

When Day One is the better choice

You want your journal on every device you own, Apple Watch, Windows and the web included, with end-to-end encrypted sync.
You want a journal with a long track record: Day One has been around since 2011.
You want photos, video, audio, drawings or PDFs in your entries, or printed books.
You mostly want a place to keep your journal, with AI as an optional extra.

When Plimm is the better choice

You want an AI that reads what you write and answers it, on your phone, with no account.
You want the AI to keep working offline.
You want AI conversations without a $74.99-a-year plan: Plimm's free plan includes one a day, and Pro is $39.99 a year.
You want crisis resources shown if an entry suggests you may be struggling.

Sources

Every fact about Day One comes from Day One's own pages, checked on September 28, 2026. Facts about Plimm come from this site: how Plimm's AI works, the privacy policy and the prices.

Plans: prices, the Basic plan, photo and media limits, On This Day, streaks, printed books, AI in Gold
AI features guide: where the AI runs, on-device features, training
Daily Chat and the Gold page: the AI conversation and what it reads
Multi-Entry Summary: patterns across entries, per-entry locations
Where is my data stored? and the end-to-end encryption FAQ: storage and encryption
Creating a Day One account: accounts, which sync needs
Backup and sync options: writing offline, and accounts for sync and cloud backup
System requirements and the App Store listing: platforms, including Apple Vision
Audio recording: voice entries and transcription
Subscribing: the free month
Privacy Pledge: since 2011

Day One is a trademark of its owner, and Plimm is not affiliated with it. If something here is out of date, write to diasjakupov04@gmail.com and it will be corrected.