Day One vs Diarium:Which is more popular?
In September 2026, Day One had more branded searches than Diarium among journaling apps worldwide. Day One had about 251,000 branded searches, while Diarium had 9,900. Day One made up 79.2% of all journaling app searches we track, and Diarium accounted for 3.1%. When we asked ChatGPT and Google AI Overviews about journaling apps, Day One appeared in all five answers and Diarium in three. Day One was mentioned before Diarium in every answer.
Who do people search for more?
Day One, about 25 searches for every 1 for Diarium
Who does AI mention more?
Day One, mentioned in every answer we collected
Who does AI recommend more?
Day One, named ahead of Diarium in every answer
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Top journaling apps in ChatGPT and Google AI Overviews
In three ChatGPT questions and two Google AI Overviews, Day One appeared in all five answers. Diarium was mentioned in three out of five: in one of the three ChatGPT answers and in both Google AI Overviews. Day One was listed before Diarium in every answer.
Most recommended by AI
Brands get a higher ranking if they are mentioned earlier in the answers.
Mentioned by AI
Each dot is one answer, filled in when that answer mentions the brand.
- Day One5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
Apple Journal5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
Journey4 of 5Named in 2 of 3 ChatGPT answersNamed in 2 of 2 Google answers
Daylio3 of 5Named in 3 of 3 ChatGPT answersNamed in 0 of 2 Google answers
Diarium3 of 5Named in 1 of 3 ChatGPT answersNamed in 2 of 2 Google answers
Reflectly1 of 5Named in 1 of 3 ChatGPT answersNamed in 0 of 2 Google answers
Penzu0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
See every answer about journaling apps
5 answers
Asked ChatGPT
“Which journaling app should I use?”
Asked ChatGPT
“What are the best journaling apps?”
Asked ChatGPT
“What's the best journaling app for daily reflection?”
Searched Google, AI Overview
“journaling apps”
Searched Google, AI Overview
“journal app”
Not named in any answer:
Brands are shown in the order each answer named them. The survey took place in the United States on October 21, 2026.
Is Day One or Diarium more popular in search?
This chart shows how often people search Google for Day One and Diarium by name. Each line represents a brand's share of searches for all seven journaling apps we track, month by month, from English-language searches worldwide.
Share of searches by month for Day One, Diarium. The figures are in the table below the chart.
View monthly share of searches table
| Month | Day One | Penzu | Daylio | Diarium | Reflectly | Apple Journal | Journey |
|---|---|---|---|---|---|---|---|
| Oct 2025 | 62.5% | 17.7% | 7.9% | 5.3% | 2.9% | 3.5% | 0.06% |
| Nov 2025 | 70.6% | 16.7% | 5% | 3.3% | 2.2% | 2.2% | 0.04% |
| Dec 2025 | 67% | 15.5% | 6.9% | 4.6% | 2.1% | 3.8% | 0.03% |
| Jan 2026 | 63% | 17.6% | 7.9% | 5.3% | 1.9% | 4.3% | 0.05% |
| Feb 2026 | 65.5% | 18.6% | 6.8% | 4.6% | 2% | 2.5% | 0.05% |
| Mar 2026 | 73% | 14% | 5.1% | 4.2% | 1.9% | 1.9% | 0.03% |
| Apr 2026 | 68.8% | 15.9% | 5.8% | 4.8% | 2.6% | 2.1% | 0.03% |
| May 2026 | 85.6% | 7.6% | 2.8% | 1.9% | 1.2% | 1% | 0.01% |
| Jun 2026 | 70% | 13.5% | 7.4% | 3.3% | 4% | 1.8% | 0.03% |
| Jul 2026 | 70.8% | 13.6% | 6.1% | 4.1% | 3.3% | 2.2% | 0.03% |
| Aug 2026 | 70.9% | 13.7% | 7.5% | 3.3% | 2.7% | 1.8% | 0.02% |
| Sep 2026 | 79.2% | 10.4% | 3.8% | 3.1% | 2.1% | 1.4% | 0.02% |
How has the Day One and Diarium comparison changed over the last 12 months?
3 findings
- Day One was ahead of Diarium in every measured month of the 12 months ending September 2026.
- Across the 12 months ending September 2026, Day One’s share of searches among journaling apps worldwide moved from 62.5% to 79.2%, and its estimated monthly branded searches moved from 117K to 251K.
- Across the 12 months ending September 2026, Diarium’s share of searches among journaling apps worldwide moved from 5.3% to 3.1%, and its estimated monthly branded searches held steady at 9.9K.
How did search popularity change for journaling apps worldwide in September 2026?
1 change
In September 2026, Day One gained share of searches among journaling apps worldwide, from 70.9% to 79.2%.
How are branded searches counted?
3 search terms
Brandwave collects information about searches that people make online using Day One’s and Diarium’s names. When viewed over time, estimated search volumes for these branded terms can be used to understand whether interest in the brands is growing, holding steady, or fading.
Other head-to-heads among journaling apps
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