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Technology answer

RainLoop

2,553

companies run it, <0.01% of 54,527,857 in the index. Landing 12 Sept 2026.

Hosts: 4,433 live hosts run it, of 191,809,695 hosts in the index, <0.01%. A host is a website, not a company.

Companies by month

Companies, monthly, on the fixed panel of sites crawled since 2020of 54,527,857 in the indexlanding 12 Sept 2026

2,553 at Sept 26; 2,172 twelve months earlier, +381, +17.5% on the fixed panel; the series starts January 2021 because the panel is anchored at 31 Dec 2020

The 69 numbers in this chart
MonthCompaniesObserved on the panel
2021-01withheld0
2021-02withheld0
2021-03withheld0
2021-04withheld0
2021-05withheld0
2021-06withheld0
2021-07withheld0
2021-08withheld0
2021-09withheld0
2021-10withheld0
2021-11withheld0
2021-12withheld0
2022-01withheld0
2022-02withheld0
2022-03withheld0
2022-04withheld0
2022-05withheld0
2022-06withheld0
2022-07withheld0
2022-08withheld0
2022-09withheld0
2022-10withheld0
2022-11withheld0
2022-12withheld0
2023-01withheld0
2023-02withheld0
2023-03withheld0
2023-04withheld0
2023-05withheld0
2023-06withheld0
2023-07withheld0
2023-08withheld0
2023-09withheld0
2023-10withheld0
2023-11withheld0
2023-12withheld0
2024-01withheld0
2024-02withheld0
2024-03withheld0
2024-04215
2024-05withheld0
2024-06withheld0
2024-07withheld0
2024-08withheld0
2024-09225
2024-1013834
2024-1128069
2024-12420103
2025-01617152
2025-02811200
2025-031,005247
2025-041,200295
2025-051,394343
2025-061,588391
2025-071,783439
2025-081,977486
2025-092,172534
2025-102,365582
2025-112,443601
2025-122,495614
2026-012,550627
2026-022,548627
2026-032,550627
2026-042,550627
2026-052,551628
2026-062,552628
2026-072,552628
2026-082,552628
2026-092,553628

Both denominators, and a third

Shares of the same 2,553each row a different wholelanding 12 Sept 2026

Denominator
Companies
Share
companies in the index
54,527,857
<0.01%
companies running anything in Productivity and Email Suites
8,549,003
0.03%
companies running anything in Webmail client software
423,431
0.60%

Three wholes, three shares of one count: a share travels with its whole, never alone. Against the last of them, RainLoop is rank 3 of 4 technologies in Webmail client software.

Open as a segment

2,553 companies; add a country, a sector or a band on the segment page. Counting is free.

/companies/tech-rainloop

Open the segment

Catalogue record

As recorded in the cataloguetaxonomy release tax-2026.10last discovered 10 Sept 2026

Self‑hosted PHP webmail application.

RainLoop is a self‑hosted webmail client written in PHP. Organizations deploy it on their own servers to provide browser‑based access to email accounts.

Kindproduct
VendorRainLoop, rainloop.net
Slugrainloop
Deploymentself-hosted
Pricingfree
Open sourceyes
First discovered2019-11-28
Last discovered2026-09-10
Taxonomy releasetax-2026.10