Notes that work like chemistry
ChemNotes is more than plain text. As you write, chemicals and measurements become interactive.
All your notes in one place.
- Easy-to-write, neat chemical notation
- Perform common lab calculations, including dilution (C1V1 = C2V2)
- Convert centrifuge speed between RPM and RCF instantly
- Conveniently convert between chemical notation and unit measurements
- Quickly retrieve data from PubChem
- And more, all from a single app!
Educational/reference tool. Not intended for medical, safety, or industrial decision-making.
About ChemNotes
ChemNotes is a fast chemistry notes and notation app with built-in calculations and optional PubChem lookups.
Made for students, educators, and working chemists
Chemical info, right where you type
Enter a common name (use a hyphen, like Sulfuric-acid) or a formula (like H2SO4) to attach a reference card with a 2D structure, formula, and key properties such as molecular weight.
Measurements detected automatically
Type “50 mL” or “10 mM” and it is picked up immediately. It is formatted as a token you can tap, copy, and reuse.
Measurements that stay consistent
Link a measurement to a chemical and ChemNotes can use molecular weight to support molar-based conversions as you work.
Drop results straight into your note
After a calculation, you can insert the result back into your line as a new token, so everything stays in one place.
Sketch and annotate
Use the built-in canvas for apparatus diagrams or reaction mechanisms, with adjustable stroke width and color.
What it looks like
Swipe/scroll to browse. Tap any image to expand.
Privacy Policy
ChemNotes is a lab notebook app that stores your notes, calculations, and drawings locally on your device. This policy explains what data may leave your device when you use ChemNotes features that fetch chemical data over the internet.
1) What ChemNotes stores
Stored on your device: Your notes, calculations, drawings, and app settings are stored locally on your device.
No developer server storage by default: ChemNotes does not require an account and does not provide a developer-controlled cloud service for storing your note contents.
2) What ChemNotes sends off your device (ChemNet / PubChem lookups)
ChemNotes includes ChemNet (chemical suggestions and lookups) that fetches reference data from PubChem (a public chemical database operated by NCBI [National Center for Biotechnology Information], part of NLM [National Library of Medicine]).
Important: When ChemNet is used, text you type in the note editor may be transmitted to PubChem to generate suggestions and retrieve reference information. This means any text you enter (including text that could contain personal information) may be sent as part of fulfilling this feature’s request.
Network metadata: Like any standard internet request, the receiving service may see technical information such as your IP address [internet protocol address] and may log request/visit data under its policies. Handling of that information is governed by NLM/NCBI's policies.
3) What ChemNotes does not do with your data
- ChemNotes does not use your note text for advertising.
- ChemNotes does not sell your data.
- ChemNotes does not attempt to build a profile of you from what you write.
- ChemNotes does not intentionally attach your name, account identity, or other identifiers to PubChem requests (but anything you type may still contain identifying information).
4) ChemNet setting (disabling network lookups)
ChemNotes includes a setting intended to disable ChemNet (chemical suggestions and lookups). When disabled, ChemNotes is designed to reduce or stop PubChem lookups initiated by the app.
However, we do not guarantee that disabling ChemNet will prevent all network requests in all circumstances (for example, due to software defects or operating system behavior). If you require zero transmission of your text off-device, do not use ChemNet and ensure your device is offline when using ChemNotes.
5) Data retention
- Developer retention: ChemNotes does not store your note contents on developer-controlled servers by default.
- Third-party retention: PubChem / NLM / NCBI may retain standard web logs according to their published policies.
6) Security and device responsibility
You are responsible for protecting your device and any data stored on it (for example, using a device passcode, Face ID [Apple facial authentication], or Touch ID [Apple fingerprint authentication], and managing backups).
ChemNotes may offer an optional in-app lock feature that relies on Apple system authentication. This feature is a convenience feature and not a guaranteed security boundary.
7) Contacting the developer
If you contact the developer for support (for example by email or a support form), you may provide information such as your email address and the contents of your message. That information is used to respond to your request and provide customer support.
8) Changes to this policy
We may update this Privacy Policy from time to time. If we make changes, we will update the effective date above. Your continued use of ChemNotes after changes take effect means you accept the updated policy.
9) Contact
Developer contact: Chemnotes.app@gmail.com
Effective date: 15/01/2026
ChemNotes Support
Need Help? Thank you for using ChemNotes. We are dedicated to providing a seamless experience for your laboratory and study needs.
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