Lookalikes · Data refreshed November 2026

25 ISL lookalikes

Compiled by the RevenueBase Data Team Data refreshed Nov 4, 2026 818 matching companies

Looking for ISL lookalikes, ISL competitors or ISL alternatives? The RevenueBase company graph holds 818 companies that do what ISL does, matched at 85%+ measured description similarity (RevenueBase, November 2026). The 25 largest are ranked below by team size; across all 818 matches RevenueBase tracks 39,857 professional contacts, including 17,350 with verified work emails.

Similarity is measured on what companies actually do, from their business descriptions rather than industry codes, and is shown per row as a percentage. This page keeps only companies at 85%+ measured similarity to ISL and ranks them by company size. Data current as of November 4, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list Similarity shown on every row Refreshed Nov 4, 2026 Match quality audited by blind human judging

Reference company

ISL

“At ISL, we share an enthusiasm for community infrastructure.”

501-1,000Employees

649Contacts tracked

436Verified emails

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The 25 largest ISL competitors and alternatives

Ranked by team size

Top 25 of 818 companies matching ISL at 85%+ description similarity, ranked by team size. Similarity is each company's measured match to ISL (100% = identical). Data refreshed Nov 4, 2026.
#	Company	HQ	Employees	Similarity	Verified emails
1	STV	Austin, US	1,001-5,000	87%	2,296 contacts →
2	KEO International Consultants	Safat, KW	1,001-5,000	86%	564 contacts →
3	CHA Consulting, INC	Keene, US	1,001-5,000	85%	1,075 contacts →
4	Rk&k	Raleigh, US	1,001-5,000	87%	1,114 contacts →
5	Consor	n/a	1,001-5,000	85%	861 contacts →
6	Voyants Solutions Private Limited	Hyderabad, IN	1,001-5,000	86%	4 contacts →
7	H&h	Fort Lauderdale, US	501-1,000	90%	363 contacts →
8	Wade Trim	Detroit, US	501-1,000	85%	523 contacts →
9	BKF Engineers	Redwood City, US	501-1,000	85%	456 contacts →
10	H2m Architects Engineers	Windsor, US	501-1,000	86%	448 contacts →
11	MSA Professional Services	Marshfield, US	501-1,000	86%	384 contacts →
12	Neel-Schaffer, INC	Jackson, US	501-1,000	88%	365 contacts →
13	Engicon	JO	501-1,000	85%	212 contacts →
14	Cobb, Fendley & Associates, INC	Miami, US	501-1,000	88%	381 contacts →
15	Mark Thomas	Fresno, US	501-1,000	86%	337 contacts →
16	Schüßler-Plan	Berlin, DE	1,001-5,000	86%	335 contacts →
17	CSA Group, Architects And Engineers	New York, US	501-1,000	86%	222 contacts →
18	Prime AE Group, INC	Jacksonville, US	501-1,000	87%	297 contacts →
19	DCCM	Houston, US	501-1,000	86%	307 contacts →
20	Herbert, Rowland & Grubic, Inc. - HRG	Lewisburg, US	201-500	89%	287 contacts →
21	Salfo & Associates SA	Athens, GR	201-500	87%	98 contacts →
22	England-Thims & Miller, INC	Deland, US	201-500	87%	264 contacts →
23	Esteyco	Madrid, ES	201-500	85%	86 contacts →
24	Entech	Iselin, US	201-500	89%	204 contacts →
25	Otak International	Abu Dhabi, AE	201-500	85%	100 contacts →

Showing the 25 largest of 818 similar companies

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How similarity works

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
Matching: Companies are matched on what they actually do, as described in their own business descriptions, never on shared industry codes. The list keeps only matches at 85%+ measured similarity to ISL, and match quality is audited by blind human judging. Read the full methodology.
Ranking: Team size, largest first, among the matched companies: companies are ordered by the number of professionals RevenueBase tracks at each one. Each row also shows its measured similarity to ISL as a percentage.
Verification: Contact records re-verify on a rolling cadence rather than being scraped once and left to decay; each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on November 4, 2026. Lists refresh periodically as the graph is re-checked.

Frequently asked

What are ISL lookalikes?

ISL lookalikes are companies that closely resemble what ISL does and sells, based on each company's own business description. The table above ranks the closest matches by company size, with each company's similarity to ISL shown as a percentage.

What companies are similar to ISL?

The largest companies similar to ISL are STV, KEO International Consultants, CHA Consulting, INC and Rk&k. The table above shows the 25 largest of the 818 matched companies, with each row's similarity shown as a percentage.

How is similarity measured?

Similarity scores how closely a company's business, as described in its own words, matches ISL's, shown as a percentage (100% = an identical description). The list keeps companies at 85% or above and ranks them by team size.

How do I get contacts at these companies?

A free RevenueBase account lets you run this exact search and work the top matches, verified emails and direct dials included. Upgrading unlocks the 17,350 verified emails and direct dials tracked across all 818 matched companies.

Who are ISL's biggest competitors?

The largest ISL competitors by measured business-description similarity are STV, KEO International Consultants, CHA Consulting, INC and Rk&k. Every company here does what ISL does at 85%+ similarity, ranked by team size.

What are the best ISL alternatives?

The closest ISL alternatives are the companies whose own business descriptions match ISL's most closely, shown above with each one's similarity as a percentage and ranked by team size.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on November 4, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.