ExpiWell vs WebMO Premium
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ExpiWell
This app facilitates experience sampling and ecological momentary assessment for research. It allows users to share opinions and experiences through surveys and daily diaries, ensuring data privacy. Researchers can collect valuable insights through this platform.
- Experience sampling method (ESM)
- Ecological momentary assessment (EMA)
- Surveys and mood tracking
- Daily diary entries
- Just-in-time adaptive interventions (JITAI)
- Digital ethnography
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ExpiWell is the premier experience sampling method (ESM) and ecological momentary assessment (EMA) app for surveys, mood tracking, daily diary, just-in-time adaptive interventions (JITAI), and digital ethnography. Market researchers, polling companies, and social scientists want your valuable opinions and experiences. Using our free app, you can share your experiences and opinions. We have real surveys that you can take. ExpiWell® ensures your privacy. We will not forward, sell, or transfer your information. ExpiWell Privacy Policy - https://app.expiwell.com/privacy ExpiWell Terms of Use - https://app.expiwell.com/tos
WebMO Premium
This app allows users to build and visualize molecules in 3D, access chemical information from external databases, and interact with advanced computational chemistry programs. It's designed for students and faculty needing mobile access to molecular structures and data.
- 3D molecular editor
- VSEPR and molecular mechanics optimization
- Orbital and symmetry visualization
- Chemical data lookup
- Computational chemistry program integration
- Spectra visualization
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WebMO Premium is equivalent in functionality to the free 'WebMO' app in conjunction with the 'WebMO Premium' in-app purchase. This paid version is provided for convienence for volume purchases. WebMO allows users to build and view molecules in 3-D, visualize orbitals and symmetry elements, lookup chemical information and properties from external databases, and access state-of-the-art computational chemistry programs. WebMO is recommended for students and faculty in high school, college, and graduate school who desire mobile access to molecular structures, information, and calculations. WebMO capabilities include: - Build molecules by drawing atoms and bonds in a 3-D molecular editor, or by speaking the name (e.g., “aspirin”) - Optimize structures using VSEPR theory or molecular mechanics - View Huckel molecular orbitals, electron density, and electrostatic potential - View molecular vibrations - View point group and symmetry elements of molecules - Lookup basic molecular information, including IUPAC and common names, stoichiometry, molar mass - Lookup chemical data from PubChem and ChemSpider - Lookup experimental and predicted molecular properties from external databases (NIST, Sigma-Aldrich) - Lookup IR, UV-VIS, NMR, and mass spectra from external databases (NIST, SDBS) - Capture high-resolution molecular images - Save and recall molecular structures locally - Export and import structures via email WebMO is also a front-end to WebMO servers (version 14 and higher): - Supports Gaussian, GAMESS, Molpro, MOPAC, NWChem, ORCA, PQS, PSI, Quantum Espresso, VASP, Q-Chem, and Tinker computational chemistry programs - Submit, monitor, and view calculations - View formatted tabular data extracted from output files, as well as raw output - Visualize geometry, partial charges, dipole moment, normal vibrational modes, molecular orbitals, and NMR/IR/UV-VIS spectra
Screenshots
Verdict
The clearest difference is price: ExpiWell at Free against WebMO Premium's $4.99. ExpiWell also leads on rating (4.6 vs 4.0) and update cadence (every 5 days vs every 17 months). WebMO Premium's advantage is review sentiment (67% vs 41%) and iOS requirement (12.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
ExpiWell is free to download; WebMO Premium costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
ExpiWell holds the better App Store score, 4.6 against 4.0. That said, the two scores are not equally well evidenced: ExpiWell has 1.4K ratings behind it against 4, so its average is the more settled of the two. Written reviews complicate that: 41% of ExpiWell's written reviews are positive against 67% of WebMO Premium's, so the app with the better star average is not the one people write more warmly about.
ExpiWell ships an update every 5 days, WebMO Premium every 17 months. The most recent releases landed on September 30, 2026 and September 19, 2026 respectively.
| Parameter | ExpiWell | WebMO Premium |
|---|---|---|
| Price | Free — better | $4.99 |
| Rating | 4.6 (1.4K ratings) — better | 4.0 (4 ratings) |
| Positive reviews | 40.7% of reviews | 66.7% of reviews — better |
| Number of ratings | 1.4K — better | 4 |
| Update frequency | Every 5 days — better | Every 17 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 67 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | Expiwell, Inc. | WebMO, LLC |
Customer experience
ExpiWell
WebMO Premium
Bugs and requests
ExpiWell
Reported bugs
3 issues- Login issues
- Incompatibility with certain devices
- Crashing during surveys
Requested features
2 requests- Better notification system
- More seamless interface
WebMO Premium
Not enough reviews yet to summarise bugs or requests.
In-app purchases
ExpiWell
No in-app purchases
WebMO Premium
No in-app purchases









