Chemist Calc vs Search PubChem
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Mole to gram conversion
- Gram to mole conversion
- Periodic table with element specifications
- Unit conversion
- Learn chemistry signs
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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.
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.
- 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
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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
Verdict
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
Both are free to download. Chemist Calc sells 1 one-off in-app purchase. Search PubChem asks for nothing beyond the download.
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.
Both ship on a similar rhythm, roughly every 9 months. Both last shipped on November 2, 2026.
| Parameter | Chemist Calc | Search PubChem |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (5 ratings) |
| Positive reviews | — | 75.0% of reviews |
| Number of ratings | 1 | 5 — better |
| Update frequency | Every 9 months | Every 9 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPad, Mac, Vision Pro — better |
| Requires iOS | 16.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 11 MB | 9 MB |
| Age rating | 4+ | 17+ |
| Developer | ilan TETRUASHVILI | Jae-Seung Lee |
Customer experience
Chemist Calc
Search PubChem
In-app purchases
Chemist Calc
- Remove Ad's$0.99
Search PubChem
No in-app purchases
Questions
Is Chemist Calc free?
Is Search PubChem free?
Which has better reviews, Chemist Calc or Search PubChem?
Do Chemist Calc or Search PubChem have ads?
Which is updated more often, Chemist Calc or Search PubChem?
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