Comparison

ExpiWell vs WebMO Premium

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Experience sampling method (ESM)
  • Ecological momentary assessment (EMA)
  • Surveys and mood tracking
  • Daily diary entries
  • Just-in-time adaptive interventions (JITAI)
  • Digital ethnography
Features
Read full description

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

About

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.

Highlights
  • 3D molecular editor
  • VSEPR and molecular mechanics optimization
  • Orbital and symmetry visualization
  • Chemical data lookup
  • Computational chemistry program integration
  • Spectra visualization
Features
Read full description

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

ExpiWell4 screens
WebMO Premium4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard7 real differences · 3 level
ExpiWell versus WebMO Premium: the parameters behind the verdict, then further details
ParameterExpiWellWebMO Premium
PriceFree — better$4.99
Rating4.6 (1.4K ratings) — better4.0 (4 ratings)
Positive reviews40.7% of reviews66.7% of reviews — better
Number of ratings1.4K — better4
Update frequencyEvery 5 days — betterEvery 17 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.012.0 — better
Further details — not scored
Size67 MB12 MB
Age rating4+4+
DeveloperExpiwell, Inc.WebMO, LLC

Customer experience

ExpiWell

All ratings1,440 ratings
Positive90.7%
Neutral4.9%
Negative4.4%
Written reviews27 reviews
Positive40.7%
Neutral18.5%
Negative40.7%

WebMO Premium

All ratings4 ratings
Positive75.0%
Neutral0.0%
Negative25.0%
Written reviews3 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

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

None

ExpiWell

No in-app purchases

None

WebMO Premium

No in-app purchases

Questions

Is ExpiWell free?
ExpiWell is free to download, with no in-app purchases.
Is WebMO Premium free?
WebMO Premium costs $4.99, with no in-app purchases.
Which has better reviews, ExpiWell or WebMO Premium?
ExpiWell is rated higher. ExpiWell averages 4.6 out of 5 from 1.4K ratings, while WebMO Premium averages 4.0 from 4 ratings.
Do ExpiWell or WebMO Premium have ads?
Neither ExpiWell nor WebMO Premium shows ads.
Which is updated more often, ExpiWell or WebMO Premium?
ExpiWell ships an update every 5 days, and WebMO Premium every 17 months. Most recently, ExpiWell was updated on September 30, 2026 and WebMO Premium on September 19, 2026.

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