Comparison

Chemist Calc vs Search PubChem

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

Head to head
About

Chemist Calc

This app serves as a smart chemistry calculator for converting between moles and grams. It also provides a comprehensive periodic table with element specifications and unit conversion tools.

Highlights
  • Mole to gram conversion
  • Gram to mole conversion
  • Periodic table with element specifications
  • Unit conversion
  • Learn chemistry signs
Features
Read full description

Chemist Calc is a very smart chemist calculator. You can calculate moles to gram or gram to moles. You also have the whole periodic table elements with specification inside. You can convert between different units and also learn about all chemistry signs.

About

Search PubChem

Access and manage chemical compound data from the PubChem database. Search for over 111 million compounds, view molecular formulas, weights, and structures, and create and track custom solutions with detailed composition information.

Highlights
  • Search PubChem database
  • View molecular formula, weight, and structure
  • Store compound information
  • Create and manage custom solutions
  • Track solution composition in grams and moles
  • Display 3D compound structures
  • Share solution data via CSV
Read full description

The app allows to search compounds through PubChem and helps to keep information on solutions made of those compounds. I. Compounds Tab Search the open chemistry database 'PubChem' at the National Institutes of Health (NIH) for chemical compounds. The app helps to find a compound by name from the collection of more than 111 million compounds. It downloads and stores the molecular formula, weight, and structure. Compounds 1. Selecting the "Compounds" tab will present a list of compounds. - If there are any solutions made of a compound, a droplet will appear next to the compound's name. 2. When a compound is selected, a view with the detailed information will appear. Follow the instruction in "Details for a compound". 3. When the "+" button is selected, a view for search will appear. Follow the instruction in "Search for a compound". Details for a compound 1. Click "Compounds" to return back to the table of compounds. 2. Click the magnifier icon to open the compound's PubChem page in the user's default web browser. 3. Click the trashcan icon to delete the compound. This function may not be available if there is a solution made of the compound. 4. Click one of the solutions made of the compound to display the information. See "Details for a solution" below. 5. Click "3D" to display a 3D structure. Use pan and pinch gestures to rotate and zoom the scene. Search for a compound 1. Select "Compound Name" ("CID") and type a compound name (PubChem CID). 2. Click "Search" to connect to PubChem. An activity indicator will appear until the search is finished. - If the search succeeds, the downloaded information will appear. - If the search fails, an alert will appear. 3. Click "Save" to store the information about a compound. 4. Click "Cancel" to dismiss the scene. II. Solutions Tab Choose compounds downloaded from PubChem and make a solution. The app allows to record a list of compounds with amounts dissolved in a solution. For the saved solutions, the app displays their compositions in gram and mol. Solutions 1. Selecting the "Solutions" tab will present a list of solutions. 2. When a solution is selected, a view with the detailed information will appear. Follow the instruction in "Details for a solution". 3. When the "+" button is selected, a view for search will appear. Follow the instruction in "Making a solution". Details for a solution 1. Click "Solutions" to return back to the table of compounds. 2. Click the 'action' icon to share a csv file containig the information about the solution. 3. Click the trashcan icon to delete the solution. 5. Choose the unit among gram, mg, mol, and mM. 6. Select one of compounds to display its structure and formula. See "Mini details for a compound" below. Making a solution 1. Click "Add Compounds" to bring a collection of compounds. See "Compounds collection" below. 2. The names of the compounds selected from "Compounds collection" will be displayed as “Solution Label”. A user can edit “Solution Label”. 3. The unit for the amount can be chosen among gram, mg, mol, and mM. 4. The amount may be entered. 5. Click "Save" to create and add a new solution. 6. Click "Cancel" to dismiss the scene. Compounds collection 1. Select or deselect compounds by clicking the images of compounds. 2. Selected compounds will be displayed. 3. Click "Done" to return back to "Making a solution". 5. Click "Cancel" to dismiss the scene.

Screenshots

Chemist Calc4 screens
Search PubChem4 screens

Verdict

The call

The clearest difference is in-app purchases: Search PubChem at none against Chemist Calc's 1. Search PubChem also leads on ratings volume (5 vs 1) and device support (4 vs 2). Chemist Calc's advantage is iOS requirement (16.0 vs 26.0). On price, rating, update cadence and ads 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

Both are free to download. Chemist Calc sells 1 one-off in-app purchase. Search PubChem asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Chemist Calc against 5.0 for Search PubChem. That said, the two scores are not equally well evidenced: Search PubChem has 5 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 9 months. Both last shipped on November 2, 2026.

Scorecard4 real differences · 6 level
Chemist Calc versus Search PubChem: the parameters behind the verdict, then further details
ParameterChemist CalcSearch PubChem
PriceFreeFree
Rating5.0 (1 ratings)5.0 (5 ratings)
Positive reviews—75.0% of reviews
Number of ratings15 — better
Update frequencyEvery 9 monthsEvery 9 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreeFree
DevicesiPhone, iPadiPhone, iPad, Mac, Vision Pro — better
Requires iOS16.0 — better26.0
Further details — not scored
Size11 MB9 MB
Age rating4+17+
Developerilan TETRUASHVILIJae-Seung Lee

Customer experience

Chemist Calc

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Search PubChem

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive75.0%
Neutral0.0%
Negative25.0%

In-app purchases

1 purchases

Chemist Calc

One-time1
  • Remove Ad's$0.99
None

Search PubChem

No in-app purchases

Questions

Is Chemist Calc free?
Chemist Calc is free to download, with in-app purchases available.
Is Search PubChem free?
Search PubChem is free to download, with no in-app purchases.
Which has better reviews, Chemist Calc or Search PubChem?
Chemist Calc and Search PubChem are both rated 5.0 out of 5 on the App Store, from 1 and 5 ratings respectively.
Do Chemist Calc or Search PubChem have ads?
Neither Chemist Calc nor Search PubChem shows ads.
Which is updated more often, Chemist Calc or Search PubChem?
Chemist Calc ships an update every 9 months, and Search PubChem every 9 months. Most recently, Chemist Calc was updated on November 2, 2026 and Search PubChem on November 2, 2026.

Other comparisons