I was dealing with anxiety during college and wanted a private space to write. Existing journal apps had ads, sold data, or felt lifeless. So I built my own, then shared it with the world.
ZenDiary grew into a product used by thousands, but the principle never changed: building for mental health means trust is everything. Privacy-first architecture, zero ads, and honest communication with users.
features
what's inside
zeni, your ai companion
Analyzes entries for cognitive patterns, offers thought reframing for negative thoughts, and remembers your journey to give personalized insight.
unlimited journaling
Write freely with photo attachments, stickers and themes. Browse memories by date. No caps, no friction.
mood tracking & pulse
Automatic mood detection from your writing, real-time emotional pulse, trend analysis, predictions, and visual stats.
pattern recognition
Surfaces emotional patterns you might miss. Relationship insights show who energizes vs. drains you; a stress radar flags triggers.
haptic breathing & tools
Physical grounding with haptic breathing synced to your phone, plus daily prompts tailored to your mood and history.
bank-grade privacy
AES-256 encryption with local-first storage, your thoughts are encrypted on-device. PIN lock, optional iCloud/Drive backup.
manifesto
article i
your thoughts are sacred
We never read, sell, or analyze your entries for ads. They’re encrypted locally on your device, we cannot read them.
article ii
clarity is a right, not a privilege
Core mental-wellness tools stay free. No ads, ever. We never sell your data to advertisers.
what users value
94%
no ads
91%
privacy-focused
88%
design quality
86%
ai helpfulness
what people say
“I discovered relationship patterns through journaling that improved my partner dynamics.”
“It helped reframe my catastrophic thinking during placement season. I got my dream job.”
“It's like talking to a wise friend. I can write my fears without judgment. So therapeutic.”
“147-day journaling streak and counting. This app helped me build a life-changing habit.”
pricing
free forever
$0- Unlimited journaling
- Photo attachments
- Basic mood tracking
- Secure local storage
- Daily prompts
zendiary+
$50/yr- Everything in Free
- Deep AI analysis
- Unlimited Zeni conversations
- Pattern recognition & stress analysis
- Cloud sync & monthly digests
behind it
ZenDiary is built by Pulkit Aggarwal, an indie developer from India. Built originally for personal use, then shared with the world.
“i didn't build this to exit. i built this to exist.”pulkit
start your journey
Join 25,000+ people finding clarity through AI-powered journaling.
ZenDiary is a self-reflection tool and is not intended to replace professional mental health care.